<div>Dear Rex,</div>
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<div>I would suggest contacting Burdens who is distributing the "Portagester" system in the UK and that could be useful for your intended use and scale. </div>
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<div>Their web is <font color="#009933"><a href="http://www.bioplex.co.uk/portagester.shtml">www.bioplex.co.uk/<b>portagester</b>.shtml</a></font></div>
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<div>Best regards,</div>
<div>Pablo.<br><br></div>
<div class="gmail_quote">2012/1/9 Alexander Eaton <span dir="ltr"><<a href="mailto:alex@sistemabiobolsa.com">alex@sistemabiobolsa.com</a>></span><br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">I concur on Paul's preference for smaller systems. I have seen a handful of proposals based on trucking waste from a number of small to medium farms where they have tried to show energy balance (all the trucks are methane powered, etc.), but the numbers never add up. Specifically, de-watering this waste requires relatively well developed systems at each site, and likely still leaves you with a serious amount of waste water treatment for each site to achieve healthy discharge levels (in Mexico it is the water, not the solids that is the treatment challenge). The management system is also more complex and requires a high level of coordination. The alternative de-centralized option will likely have similar initial capital costs, but you can make a better case for farmer investment as they will reap the benefits. You then have much smaller long-term operating costs, and all that energy for trucking can go to good use (or maybe still trucking some effluent fertilizer to local fields). As Paul mentioned, the option to eventually pipe gas a larger distance for centralized use is an option that may make sense (but I have not seen it outside of the European context or large landfill gas context yet).
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<div>Cheers</div>
<div><br></div>
<div>A<br>
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<div class="h5">On Sun, Jan 8, 2012 at 10:51 PM, Paul Harris <span dir="ltr"><<a href="mailto:paul.harris@adelaide.edu.au" target="_blank">paul.harris@adelaide.edu.au</a>></span> wrote:<br></div></div>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">G’day Rex,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Apparently a lot of the biogas comes from the fines/solutes in the liquid – I noticed that with piggery effluent the raw effluent was almost impermeable to water (it would hold puddles for quite a while) but after treatment the solids were pretty free draining (water disappeared in minutes).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">I will also raise my usual point in favour of distributed systems – why not put smaller (cheaper!) digesters at each farm and if necessary pipe the biogas to a central generator (depending on distance)? You will be spending a lot of energy on trucking waste in and then you have to truck the digestate out from the central facility again. The total capital cost may be higher, with more units to maintain, but you can start with one or two and spread the finances out a bit as well as helping local employment (I guess people will be working on digesters instead of driving trucks!).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Happy digesting,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">HOOROO<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">-- <u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:Consolas;COLOR:#1f497d;FONT-SIZE:10.5pt">Mr. Paul Harris, Room 202, Charles Hawker Building <u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:Consolas;COLOR:#1f497d;FONT-SIZE:10.5pt">Faculty of Sciences, The University of Adelaide, Waite Campus, <u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:Consolas;COLOR:#1f497d;FONT-SIZE:10.5pt">PMB 1, Glen Osmond SA 5064<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:Consolas;COLOR:#1f497d;FONT-SIZE:10.5pt">Ph : +61 8 8303 7880 Fax : <a href="tel:%2B61%208%208303%204386" target="_blank" value="+61883034386">+61 8 8303 4386</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:Consolas;COLOR:#1f497d;FONT-SIZE:10.5pt"><a href="mailto:paul.harris@adelaide.edu.au" target="_blank">mailto:paul.harris@adelaide.edu.au</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:Consolas;COLOR:#1f497d;FONT-SIZE:10.5pt"><a href="http://www.adelaide.edu.au/directory/paul.harris" target="_blank">http://www.adelaide.edu.au/directory/paul.harris</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">CRICOS Provider Number 00123M<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="FONT-FAMILY:'Tahoma','sans-serif';FONT-SIZE:10pt" lang="EN-US">From:</span></b><span style="FONT-FAMILY:'Tahoma','sans-serif';FONT-SIZE:10pt" lang="EN-US"> <a href="mailto:digestion-bounces@lists.bioenergylists.org" target="_blank">digestion-bounces@lists.bioenergylists.org</a> [mailto:<a href="mailto:digestion-bounces@lists.bioenergylists.org" target="_blank">digestion-bounces@lists.bioenergylists.org</a>] <b>On Behalf Of </b>REX<br>
<b>Sent:</b> Sunday, 8 January 2012 5:26 PM<br><b>To:</b> <a href="mailto:digestion@lists.bioenergylists.org" target="_blank">digestion@lists.bioenergylists.org</a><br><b>Subject:</b> [Digestion] 5000 dairy cow AD system<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt">Hi All,<u></u><u></u></span></p></div>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt"> <u></u><u></u></span></p></div>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt">I have been approached to put together a proposal for a centralised AD using the manure from 5000 dairy cows. The intention is to pre-concentrate the dairy manure slurry and to truck the solids to a central processing unit. As silage and grass is extensively used as feed, we would be able to co-digest this with the manure to increase the gas output. Furthermore, it is intended to use the exhaust gas and the AD liquor to grow macro algae or a plant such as hyacinth (an indigenous variety that is not likely to become an invader should it get out) which can be shredded and added back to digestion. We aim to use the gas for power generation and to use the heat to keep the digester(s) warm.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt"> <u></u><u></u></span></p></div>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt">Questions:<u></u><u></u></span></p></div>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt">1. By leaving the water behind, do we lose most/all/some of the FFA? What impact would it have on gas production?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt">2. Can anyone recommend a supplier of technology for this size of plant?<u></u><u></u></span></p></div>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt">3. 5000 cows is an arbitrary amount at this stage - 10 farms of 500 cows each. Is there a better/more economical size?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt"> <u></u><u></u></span></p></div>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt">Kind regards<u></u><u></u></span></p></div>
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<p class="MsoNormal"><span style="FONT-FAMILY:'Courier New';FONT-SIZE:10pt">Rex Zietsman<u></u><u></u></span></p></div></div></div></div></div></div></div></div></div><br>
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<br>for more information about digestion, see<br>Beginner's Guide to Biogas<br><a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
<br><br></div></blockquote></div><br><br clear="all">
<div><br></div>-- <br>Alexander Eaton<br>Sistema Biobolsa<br>IRRI-Mexico<br>RedBioLAC<br><br>Mex cel: (55) 11522786<br>US cel: <a href="tel:970%20275%204505" target="_blank" value="+19702754505">970 275 4505</a><br><br><a href="mailto:alex@irrimexico.org" target="_blank">alex@irrimexico.org</a><br>
<a href="mailto:alex@sistemabiobolsa.com" target="_blank">alex@sistemabiobolsa.com</a><br><br><a href="http://sistemabiobolsa.com/" target="_blank">sistemabiobolsa.com</a><br><a href="http://www.irrimexico.org/" target="_blank">www.irrimexico.org</a><br>
<a href="http://www.redbiolac.org/" target="_blank">www.redbiolac.org</a><br><br></div></div><br>_______________________________________________<br>Digestion mailing list<br><br>to Send a Message to the list, use the email address<br>
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<br>for more information about digestion, see<br>Beginner's Guide to Biogas<br><a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
<br><br></blockquote></div><br>